int buttonPin = 8;
int ledPin = 21;

int buttonState = 0;

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin , INPUT_PULLUP);
  digitalWrite(ledPin, LOW);
}

void loop() {
  if(digitalRead(buttonPin) == LOW){
    digitalWrite(ledPin, HIGH);
    Serial.println(digitalRead(buttonPin));
    buttonState = 1;
    if(buttonState = 1){
      Serial.println("Action is happening");
      delay(5000);
      Serial.println("Action is over");
      delay(1000);
      buttonState = 0;
    }
  } else {
    digitalWrite(ledPin, LOW);
    Serial.println(digitalRead(buttonPin));
  }
}